Headset



FIG. 1 is a top, front and left side view of a headset showing my new design, portions being show in broken lines for illustrative and environmental purposes only and the broken lines forming no part of the claimed design;

FIG. 2 is a top plan view thereof;

FIG. 3 is a left side view thereof;

FIG. 4 is a front view thereof;

FIG. 5 is a right side view thereof;

FIG. 6 is a rear view thereof; and,

FIG. 7 is a bottom plan view thereof. 

I claim the ornamental design for a headset, as shown and described. 